/*
 * This program is free software: you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software
 * Foundation, either version 3 of the License, or (at your option) any later
 * version.
 * 
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
 * details.
 * 
 * You should have received a copy of the GNU General Public License along with
 * this program. If not, see <http://www.gnu.org/licenses/>.
 */
package com.l2emu.gameserver.idfactory;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.logging.Logger;

import com.l2emu.Config;
import com.l2emu.L2DatabaseFactory;

/**
 * This class ...
 *
 * @version $Revision: 1.3.2.1.2.7 $ $Date: 2005/04/11 10:06:12 $
 */
public abstract class IdFactory
{
	private static Logger _log = Logger.getLogger(IdFactory.class.getName());
	
	protected static final String[] ID_UPDATES = {
			"UPDATE items                 SET owner_id = ?    WHERE owner_id = ?",
			"UPDATE items                 SET object_id = ?   WHERE object_id = ?",
			"UPDATE character_quests      SET charId = ?     WHERE charId = ?",
			"UPDATE character_friends     SET charId = ?     WHERE charId = ?",
			"UPDATE character_friends     SET friendId = ?   WHERE friendId = ?",
			"UPDATE character_hennas      SET charId = ? WHERE charId = ?",
			"UPDATE character_recipebook  SET charId = ? WHERE charId = ?",
			"UPDATE character_shortcuts   SET charId = ? WHERE charId = ?",
			"UPDATE character_shortcuts   SET shortcut_id = ? WHERE shortcut_id = ? AND type = 1", // items
			"UPDATE character_macroses    SET charId = ? WHERE charId = ?", "UPDATE character_skills      SET charId = ? WHERE charId = ?",
			"UPDATE character_skills_save SET charId = ? WHERE charId = ?", "UPDATE character_subclasses  SET charId = ? WHERE charId = ?",
			"UPDATE characters            SET charId = ? WHERE charId = ?",
			"UPDATE characters            SET clanid = ?      WHERE clanid = ?",
			"UPDATE clan_data             SET clan_id = ?     WHERE clan_id = ?",
			"UPDATE siege_clans           SET clan_id = ?     WHERE clan_id = ?",
			"UPDATE clan_data             SET ally_id = ?     WHERE ally_id = ?",
			"UPDATE clan_data             SET leader_id = ?   WHERE leader_id = ?",
			"UPDATE pets                  SET item_obj_id = ? WHERE item_obj_id = ?",
			"UPDATE character_hennas     SET charId = ? WHERE charId = ?",
			"UPDATE itemsonground         SET object_id = ?   WHERE object_id = ?",
			"UPDATE auction_bid          SET bidderId = ?      WHERE bidderId = ?",
			"UPDATE auction_watch        SET charObjId = ?     WHERE charObjId = ?",
			"UPDATE clanhall             SET ownerId = ?       WHERE ownerId = ?"
	};
	
	protected static final String[] ID_CHECKS = {
			"SELECT owner_id    FROM items                 WHERE object_id >= ?   AND object_id < ?",
			"SELECT object_id   FROM items                 WHERE object_id >= ?   AND object_id < ?",
			"SELECT charId     FROM character_quests      WHERE charId >= ?     AND charId < ?",
			"SELECT charId     FROM character_friends     WHERE charId >= ?     AND charId < ?",
			"SELECT charId     FROM character_friends     WHERE friendId >= ?   AND friendId < ?",
			"SELECT charId     FROM character_hennas      WHERE charId >= ? AND charId < ?",
			"SELECT charId     FROM character_recipebook  WHERE charId >= ?     AND charId < ?",
			"SELECT charId     FROM character_shortcuts   WHERE charId >= ? AND charId < ?",
			"SELECT charId     FROM character_macroses    WHERE charId >= ? AND charId < ?",
			"SELECT charId     FROM character_skills      WHERE charId >= ? AND charId < ?",
			"SELECT charId     FROM character_skills_save WHERE charId >= ? AND charId < ?",
			"SELECT charId     FROM character_subclasses  WHERE charId >= ? AND charId < ?",
			"SELECT charId      FROM characters            WHERE charId >= ?      AND charId < ?",
			"SELECT clanid      FROM characters            WHERE clanid >= ?      AND clanid < ?",
			"SELECT clan_id     FROM clan_data             WHERE clan_id >= ?     AND clan_id < ?",
			"SELECT clan_id     FROM siege_clans           WHERE clan_id >= ?     AND clan_id < ?",
			"SELECT ally_id     FROM clan_data             WHERE ally_id >= ?     AND ally_id < ?",
			"SELECT leader_id   FROM clan_data             WHERE leader_id >= ?   AND leader_id < ?",
			"SELECT item_obj_id FROM pets                  WHERE item_obj_id >= ? AND item_obj_id < ?",
			"SELECT object_id   FROM itemsonground        WHERE object_id >= ?   AND object_id < ?"
	};
	
	protected boolean _initialized;
	
	public static final int FIRST_OID = 0x10000000;
	public static final int LAST_OID = 0x7FFFFFFF;
	public static final int FREE_OBJECT_ID_SIZE = LAST_OID - FIRST_OID;
	
	protected static final IdFactory _instance;
	
	protected IdFactory()
	{
		setAllCharacterOffline();
		cleanUpDB();
	}
	
	static
	{
		switch (Config.IDFACTORY_TYPE)
		{
			case Compaction:
				_instance = new CompactionIDFactory();
				break;
			case BitSet:
				_instance = new BitSetIDFactory();
				break;
			case Stack:
				_instance = new StackIDFactory();
				break;
			default:
				_instance = null;
				break;
		}
	}
	
	/**
	 * Sets all character offline
	 */
	private void setAllCharacterOffline()
	{
		Connection con = null;
		try
		{
			con = L2DatabaseFactory.getInstance().getConnection();
			Statement statement = con.createStatement();
			statement.executeUpdate("UPDATE characters SET online = 0");
			statement.close();
			
			_log.info("Updated characters online status.");
		}
		catch (SQLException e)
		{
		}
		finally
		{
			try
			{
				con.close();
			}
			catch (Exception e)
			{
			}
		}
	}
	
	/**
	 * Cleans up Database
	 */
	private void cleanUpDB()
	{
		Connection con = null;
		try
		{
			int cleanCount = 0;
			con = L2DatabaseFactory.getInstance().getConnection();
			Statement stmt = con.createStatement();
			//Character related
			cleanCount += stmt.executeUpdate("DELETE FROM character_friends WHERE character_friends.charId NOT IN (SELECT charId FROM characters);");
			cleanCount += stmt.executeUpdate("DELETE FROM character_hennas WHERE character_hennas.charId NOT IN (SELECT charId FROM characters);");
			cleanCount += stmt.executeUpdate("DELETE FROM character_macroses WHERE character_macroses.charId NOT IN (SELECT charId FROM characters);");
			cleanCount += stmt.executeUpdate("DELETE FROM character_quests WHERE character_quests.charId NOT IN (SELECT charId FROM characters);");
			cleanCount += stmt.executeUpdate("DELETE FROM character_recipebook WHERE character_recipebook.charId NOT IN (SELECT charId FROM characters);");
			cleanCount += stmt.executeUpdate("DELETE FROM character_shortcuts WHERE character_shortcuts.charId NOT IN (SELECT charId FROM characters);");
			cleanCount += stmt.executeUpdate("DELETE FROM character_skills WHERE character_skills.charId NOT IN (SELECT charId FROM characters);");
			cleanCount += stmt.executeUpdate("DELETE FROM character_skills_save WHERE character_skills_save.charId NOT IN (SELECT charId FROM characters);");
			cleanCount += stmt.executeUpdate("DELETE FROM character_subclasses WHERE character_subclasses.charId NOT IN (SELECT charId FROM characters);");
			cleanCount += stmt.executeUpdate("DELETE FROM cursed_weapons WHERE cursed_weapons.charId NOT IN (SELECT charId FROM characters);");
			cleanCount += stmt.executeUpdate("DELETE FROM heroes WHERE heroes.charId NOT IN (SELECT charId FROM characters);");
			cleanCount += stmt.executeUpdate("DELETE FROM olympiad_nobles WHERE olympiad_nobles.charId NOT IN (SELECT charId FROM characters);");
			cleanCount += stmt.executeUpdate("DELETE FROM pets WHERE pets.item_obj_id NOT IN (SELECT object_id FROM items);");
			cleanCount += stmt.executeUpdate("DELETE FROM seven_signs WHERE seven_signs.charId NOT IN (SELECT charId FROM characters);");
			//Auction
			// cleanCount += stmt.executeUpdate("DELETE FROM auction WHERE auction.id IN (SELECT id FROM clanhall WHERE ownerId <> 0);");
			// cleanCount += stmt.executeUpdate("DELETE FROM auction_bid WHERE auctionId IN (SELECT id FROM clanhall WHERE ownerId <> 0)");
			//Clan related
			stmt.executeUpdate("UPDATE clan_data SET auction_bid_at = 0 WHERE auction_bid_at NOT IN (SELECT auctionId FROM auction_bid);");
			cleanCount += stmt.executeUpdate("DELETE FROM clan_data WHERE clan_data.leader_id NOT IN (SELECT charId FROM characters);");
			cleanCount += stmt.executeUpdate("DELETE FROM auction_bid WHERE auction_bid.bidderId NOT IN (SELECT clan_id FROM clan_data);");
			cleanCount += stmt.executeUpdate("DELETE FROM clanhall_functions WHERE clanhall_functions.hall_id NOT IN (SELECT id FROM clanhall WHERE ownerId <> 0);");
			cleanCount += stmt.executeUpdate("DELETE FROM clan_privs WHERE clan_privs.clan_id NOT IN (SELECT clan_id FROM clan_data);");
			cleanCount += stmt.executeUpdate("DELETE FROM clan_skills WHERE clan_skills.clan_id NOT IN (SELECT clan_id FROM clan_data);");
			cleanCount += stmt.executeUpdate("DELETE FROM clan_subpledges WHERE clan_subpledges.clan_id NOT IN (SELECT clan_id FROM clan_data);");
			cleanCount += stmt.executeUpdate("DELETE FROM clan_wars WHERE clan_wars.clan1 NOT IN (SELECT clan_id FROM clan_data);");
			cleanCount += stmt.executeUpdate("DELETE FROM clan_wars WHERE clan_wars.clan2 NOT IN (SELECT clan_id FROM clan_data);");
			cleanCount += stmt.executeUpdate("DELETE FROM siege_clans WHERE siege_clans.clan_id NOT IN (SELECT clan_id FROM clan_data);");
			cleanCount += stmt.executeUpdate("DELETE FROM clan_notices WHERE clan_notices.clan_id NOT IN (SELECT clan_id FROM clan_data);");
			stmt.executeUpdate("UPDATE castle SET taxpercent=0 WHERE castle.id NOT IN (SELECT hasCastle FROM clan_data);");
			//Character & clan related
			cleanCount += stmt.executeUpdate("DELETE FROM items WHERE items.owner_id NOT IN (SELECT charId FROM characters) AND items.owner_id NOT IN (SELECT clan_id FROM clan_data);");
			stmt.executeUpdate("UPDATE characters SET clanid=0 WHERE characters.clanid NOT IN (SELECT clan_id FROM clan_data);");
			stmt.executeUpdate("UPDATE clan_subpledges SET leader_id=0 WHERE clan_subpledges.leader_id NOT IN (SELECT charId FROM characters) AND leader_id > 0;");
			//Forum related
			cleanCount += stmt.executeUpdate("DELETE FROM forums WHERE forums.forum_owner_id NOT IN (SELECT clan_id FROM clan_data) AND forums.forum_parent=2;");
			cleanCount += stmt.executeUpdate("DELETE FROM topic WHERE topic.topic_forum_id NOT IN (SELECT forum_id FROM forums);");
			cleanCount += stmt.executeUpdate("DELETE FROM posts WHERE posts.post_forum_id NOT IN (SELECT forum_id FROM forums);");
			
			stmt.close();
			_log.info("Cleaned " + cleanCount + " elements from database.");
		}
		catch (SQLException e)
		{
		}
		finally
		{
			try
			{
				con.close();
			}
			catch (Exception e)
			{
			}
		}
	}
	
	/**
	 * @param con
	 * @return
	 * @throws SQLException
	 */
	protected int[] extractUsedObjectIDTable() throws SQLException
	{
		Connection con = null;
		try
		{
			con = L2DatabaseFactory.getInstance().getConnection();
			
			//create a temporary table
			Statement statement = con.createStatement();
			
			statement.executeUpdate("DROP TABLE IF EXISTS temporaryObjectTable");
			statement.executeUpdate("DELETE FROM itemsonground WHERE object_id IN (SELECT object_id FROM items)");
			statement.executeUpdate("CREATE TABLE temporaryObjectTable" + " (object_id int NOT NULL PRIMARY KEY)");
			
			statement.executeUpdate("INSERT INTO temporaryObjectTable (object_id)" + " SELECT charId FROM characters");
			statement.executeUpdate("INSERT INTO temporaryObjectTable (object_id)" + " SELECT object_id FROM items");
			statement.executeUpdate("INSERT INTO temporaryObjectTable (object_id)" + " SELECT clan_id FROM clan_data");
			//statement.executeUpdate("INSERT INTO temporaryObjectTable (object_id)" + " SELECT crest_id FROM clan_data WHERE crest_id > 0");
			statement.executeUpdate("INSERT INTO temporaryObjectTable (object_id)" + " SELECT object_id FROM itemsonground");
			
			ResultSet result = statement.executeQuery("SELECT COUNT(object_id) FROM temporaryObjectTable");
			
			result.next();
			int size = result.getInt(1);
			result.close();
			int[] tmp_obj_ids = new int[size];
			//_log.info("tmp table size: " + tmp_obj_ids.length);
			
			result = statement.executeQuery("SELECT object_id FROM temporaryObjectTable ORDER BY object_id");
			
			int idx = 0;
			while (result.next())
			{
				tmp_obj_ids[idx++] = result.getInt(1);
			}
			
			result.close();
			statement.close();
			
			return tmp_obj_ids;
		}
		finally
		{
			try
			{
				con.close();
			}
			catch (Exception e)
			{
			}
		}
	}
	
	public boolean isInitialized()
	{
		return _initialized;
	}
	
	public static IdFactory getInstance()
	{
		return _instance;
	}
	
	public abstract int getNextId();
	
	/**
	 * return a used Object ID back to the pool
	 * @param object ID
	 */
	public abstract void releaseId(int id);
	
	public abstract int size();
}